[FW][FIX] mail: incorrect unread counter on message post #159404
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Before this PR, a race condition occurred when posting a message: if the bus notification was received before the result of the message post RPC, the unread counter was set to the number of messages in the channel.
This occurs because the
discuss.channel.member/seen
notification is processed before thediscuss.channel/new_message
one so the message is not yet inserted inthread.messages
.Steps to reproduce the issue:
Forward-Port-Of: #159190
Forward-Port-Of: #158087